1. Parkinson Unit IRCCS Hospital San Camillo Venice Italy
2. National Parkinson Foundation International Centre of Excellence King's College Hospital King's College London UK
3. UCB Pharma Monheim am Rhein Germany
4. UCB Pharma Raleigh NC USA
5. Departments of Psychiatry and Neurology University of Pennsylvania School of Medicine Philadelphia PA USA
6. Parkinson's Disease and Mental Illness Research Education and Clinical Centers (PADRECC and MIRECC) Philadelphia Veterans Affairs Medical Center Philadelphia PA USA